Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 16 21ppw756 inspec40
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16-3
COOLING - COOLING SYSTEM
160M6-02
INSPECTION
1. INSPECT THERMOSTAT
HINT:
The thermostat is numbered with the valve opening tempera-
ture.
P13560
(a) Immerse the thermostat in water and gradually heat the
water.
(b) Check the valve opening temperature of the thermostat.
Valve opening temperature:
80 to 84_C (176 to 183_F)
If the valve opening temperature is not as specified, replace the
thermostat.
P00436
(c) Check the valve lift.
Valve lift: 10 mm (0.394 in.) or more at 95_C (203_F)
If the valve lift is not as specified, replace the thermostat.
(d) Check that the valve is fully closed when the thermostat
is at low temperatures (below 77_C (171_F)).
If not closed, replace the thermostat.
10mm
A51911
2. INSPECT WATER OUTLET CAP SUB-ASSY
NOTICE:
S If the radiator cap has contaminations, rinse it with
water.
S Before using a radiator cap tester, wet the relief valve
and pressure valve with engine coolant or water.
S When performing steps (a) and (b) below, keep the
tester at an angle of over 30_ above the horizontal.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2503
16-4
COOLING - COOLING SYSTEM
(a) Using a radiator cap tester, slowly pump the tester and
Radiator Cap Tester check that air is coming from the vacuum valve.
Pump speed: 1 push / 3 seconds or more
NOTICE:
Push the pump at a constant speed.
30_ or more
If air is not coming from the vacuum valve, replace the radiator
cap.
Radiator Cap (b) Pump the tester and measure the relief valve opening
A51912 pressure.
Pump speed: 1 push within 1 second
NOTICE:
The following pump speed is for the first pump only (in or-
der to close the vacuum valve). After the first pump, the
pump speed can be reduced.
Standard opening pressure:
83 to 113 kPa (0.85 to 1.15 kgf/cm2, 12.1 to 16.4 psi)
Minimum opening pressure:
69 kPa (0.7 kgf/cm2, 10.0 psi)
If the opening pressure is less than minimum, replace the radia-
tor cap.
HINT:
Use the tester's maximum reading as the opening pressure.
3. INSPECT WATER PUMP ASSY
Turn (a) Visually check the drain hole for coolant leakage.
If leakage is found, replace the water pump.
(b) Turn the pulley, and check that the water pump bearing
moves smoothly and does not make noise.
If necessary, replace the water pump.
P12487
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2504
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